Thanks for your answer.
>Your assumption is incorrect. As the latitude changes, so does the >number of pixels per degree. Does this means that for a fixed tile height of 256 pixels, the number of degrees is different at 60 deg. latitude thant to 40 deg. latitude ? My idea was to create an X/Y coordinate system based on degrees (not pixels) with (0,0) at the center, then I was thinking in to calculate the tile number for a given X/Y or (long/lat) point by simply doing something like (I need this for some kind of desktop drawing program) : tileleft = ( X - XOrigin) / tile_width_degrees tiletop = (Y - YOrgin) / tile_height_degrees Just to be sure, I must ask: then, based on your answer and what I have seen in your page, it is not possible to do so ? Thanks 2010/5/11 maps.huge.info [Maps API Guru] <[email protected]> > Your assumption is incorrect. As the latitude changes, so does the > number of pixels per degree. > > I suggest reviewing the formulas for computing tiles and pixels, they > are fairly simple but are not linear. > > You can get them from my perl module here: > > http://www.usnaviguide.com/google-tiles.htm > > -John Coryat > > http://maps.huge.info > > http://www.usnaviguide.com > > http://www.zipmaps.net > > -- > You received this message because you are subscribed to the Google Groups > "Google Maps API" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-maps-api%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-maps-api?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.
